Messages in this thread | | | Date | Sat, 9 Sep 2023 23:16:05 +0200 | From | Andrew Lunn <> | Subject | Re: [PATCH 2/4] dt-bindings: net: dsa: document internal MDIO bus |
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Please trim the text when replying.
> I'm writing below as a mix of patch log and discussion. > > Phylink bindings are required for ports that are controlled by OF-based > buses. DSA, like any other driver utilising the Linux MDIO infrastructure, > can register a bus. If I understand correctly, non-OF-based registration of > OpenFirmware MDIO buses is a feature specific to DSA which certain DSA > subdrivers make use of.
This is not really DSA specific. Any MAC driver, or MDIO driver, can call mdiobus_regsiter(), or of_mdiobus_register() and pass a NULL pointer if there is no OF node available. It then requires that the MAC driver uses an function like phy_find_first(), or knows via other means what address the PHY uses on the bus. For DSA, that other means is assuming a 1:1 mapping between port number and bus address.
Andrew
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